City Councilman Larry Seabrook ran his own taxpayer-funded “friends and family plan,” prosecutors said yesterday at his corruption trial.

The Bronx pol and his mistress went on wild spending sprees to try to drain every last dime of taxpayer funds earmarked for nonprofits he secretly controlled, an ex-employee testified.

Philesha Jude, who handled the books for the groups, also confirmed that some $612,000 in after-tax payments were made to the Democrat’s friends and relatives, including a whopping $304,000 to girlfriend Gloria Jones-Grant between 2002 and 2009.

Jude — testifying under a non-prosecution deal — further admitted that she double-billed the city, forged signatures and backdated a slew of checks and other documents at the direction of Jones-Grant, who served as the group’s executive director.

“She told me that we had to make sure that we received most, if not all, of the money we had been contracted for” through council discretionary funding arranged by Seabrook, Jude told a Manhattan federal court jury.

But Jude described Jones-Grant — who has been granted immunity to force her own testimony against Seabrook — as little more than a figurehead atop the nonprofits.

Jude said Seabrook personally drew up the group’s annual budgets and handled the hiring for a host of jobs that were never publicly advertised — and which Manhattan US Attorney Preet Bharara has called Seabrook’s “corrupt, City Council-funded ‘friends and family plan.’ ”

In addition to the payments to Jones-Grant, a chart entered into evidence showed payments to several Seabrook relatives and Jones-Grant’s son.

Jude, 29, of Queens, said she got sucked into the shady shenanigans as part of her first job after graduating from college.

She learned from a friend who worked for Seabrook that one of the nonprofits — the North East Bronx Redevelopment Corp. — was hiring, and got a $25,000-a-year job as Jones-Grant’s executive assistant in 2005.

She soon got promoted to fiscal coordinator of NEBRC and another nonprofit, the New York African-American Legal and Civic Hall of Fame, whose budgets she typed up for submission to city officials, she said.

“My first step was to get the blank budget sheet to Larry Seabrook,” Jude testified.

She also claimed that Seabrook and Jones-Grant would furiously shop for office equipment in the days before the end of the city’s fiscal year on June 30.

A receipt entered into evidence showed that the Hall of Fame group spent about $3,065 buying computers, printers, a fax machine and other items at a P.C. Richard & Son electronics store on June 29, 2006.